\begin{tabular}{llll}
\toprule
{} &  $\sigma$ &    $\phi$ & $\alpha_0$ \\
\midrule
estimate &  2.096055 &  0.294007 &   0.142842 \\
se       &  0.063596 &  0.049669 &   0.004335 \\
\bottomrule
\end{tabular}
